Registers – Coded record sensors – Particular sensor structure
Patent
1996-06-03
1998-09-15
Hajec, Donald T.
Registers
Coded record sensors
Particular sensor structure
235454, 235455, 235462, 235470, G06K 710
Patent
active
058082867
ABSTRACT:
A casing, including a grip portion and a head portion, houses a pair of light sources for illumination, an image sensing device, an optical system for forming an image on the image sensing device, a photosensor for detecting the luminance of symbol reading area, a signal processing circuit, and a light quantity detection circuit. The housing extends from the head portion towards the symbol reading area. An ambient light window is provided in the housing for introducing ambient light into the symbol reading area. A light source driving circuit controls an amount of light emitted by the light source, by increasing or decreasing the amount of light, such that the combined ambient light and light source illumination is between predetermined levels. A selector is provided for selecting between a first mode, in which a maximum illumination is decreased to an upper limit of an acceptable illumination range, and a second mode, in which a minimum illumination is increased to a lower limit of an acceptable illumination range.
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Ishizuka Yukihiro
Nukui Makoto
Seo Shuzo
Shin Takeharu
Tani Nobuhiro
Asahi Kogaku Kogyo Kabushiki Kaisha
Hajec Donald T.
Lee Michael G.
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